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When GPS data exists, it identifies a position near the camera's location, but not necessarily the exact location. To classify an object as, for example, Dewey class number Topology i. However, investigators may only have one photo.

The year would be recorded as An example of structural metadata would be how pages are ordered to form chapters of a book. At any given time, your device may hear beacons from a half dozen wireless access points APs.

If you know the cryptographic algorithm, then you can compare the signature with the metadata and image in order to detect whether the picture is camera-original. For example, the picture may show a person in a building, but the GPS coordinates -- with the DoP's approximate range -- pinpoint an outside location that is not adjacent to any buildings.

Many mobile devices also record the timestamp when the measurement was taken. An example of a linear metadata schema is the Dublin Core schema, which is one dimensional. However in practice, these IDs are usually unverifiable.

Alternately, if a picture is supported to come from a known camera and the serial number does not match, then fraud can be detected.

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The circle of accuracy is based on a measurement called the dilution of precision DoP. For example, zoom settings both real zoom and digital zoom can capture a distant object.

Metadata can be used to make organizing in post-production easier with the use of key-wording. Likewise, you can find out where the photo was taken by looking at the location information An online exif data reader can show you all these hidden information. Standards[ edit ] International standards apply to metadata.